JA Michell TecnoDec armboard question

The TecnoDec armboard is pre-drilled for the newer 3 point mount Rega arms. However, I cannot seem to find the right sized bolts/screws to fit the holes. Does anyone know the size or dimensions for the correct screws or a source for them? I've tried my dealer, the US distributor and have an e-mail to JA Michell in the UK but so far no answers. Thanks if you can help!